Billbo I've been using the 15-50 since switching from Joe Gibbs hot rod oil about 10 k ago , oil pressure hot Idle 35 LBS , 3000rpm 60 LBS .Haven't had any issues and always check dumped oil for any shavings after pouring old oil in container for recycling and magnetic drain plug is clean. I use the new Ryco oil filters (Black type ) as they screen better than your std type but in saying that I use some earth magnets around the oil filter to catch anything just in case. Just being Anal ...